Garland MCO-GD-10M Service Manual
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Garland MCO-GD-10M Service Manual

The "master" gas convection ovens
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SERVICE MANUAL
THE "MASTER"
GAS CONVECTION
Models covered in this manual are:
M
C
ASTER
ONVECTION
M
C
ASTER
ONVECTION
M
C
ASTER
M
C
ASTER
ONVECTION
185 East South Street
DIRECT "ON-SITE" SERVICE 1-800-451-1165
FORM #GCI-MCOVN
GARLAND
A WELBILT COMPANY
BUILT TO LEAD... BUILT TO LAST
OVENS
Oven - G
S
AS
O
- G
S
VEN
AS
TANDARD
Oven - G
ONVECTION
AS
Oven - G
D
AS
GARLAND Commercial Industries, Inc.
MCO-GS-10M:
D
-(10)S
TANDARD
EPTH
MCO-GS-10E:
D
-(10)Single D
EPTH
MCO-GD-10M:
D
D
-(10)S
EEP
EPTH
INGLE
MCO-GD-10E:
D
-(10)S
EEP
EPTH
INGLE
Freeland, Pennsylvania 18224
GENERAL INFORMATION 1-800-424-2411
D
Manual C
INGLE
ECK
E
ECK
LECTRONIC
D
Manual C
ECK
ONTROL
D
E
C
ECK
LECTRONIC
ONTROL
PRINTED IN THE U.S.A.
ONTROL
C
ONTROL

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Summary of Contents for Garland MCO-GD-10M

  • Page 1 GAS CONVECTION Models covered in this manual are: ASTER ONVECTION ASTER ONVECTION ASTER ONVECTION ASTER ONVECTION GARLAND Commercial Industries, Inc. 185 East South Street DIRECT “ON-SITE” SERVICE 1-800-451-1165 FORM #GCI-MCOVN GARLAND A WELBILT COMPANY OVENS MCO-GS-10M: Oven - G TANDARD...

  • Page 2: Table Of Contents

    Sequence of Operation. This book is broken down into sections, each section will list the applicable topics. Use the Table of Contents to locate the topic and function that you are attempting to trouble-shoot. SECTION 1: SPECIFICATION & DIMENSIONS ...3 GAS CONVECTION OVEN "GAS SPECIFICATIONS”...4 DIMENSIONS & SPECIFICATIONS ...4 SECTION 2: OVERVIEW OF OPERATIONAL SEQUENCES ...4 MANUAL CONTROLS - "M”...

  • Page 3: Section 1: Specification & Dimensions

    DISASSEMBLY OF THE RIGHT DOOR (W/O WINDOW) ... 20 TO REPLACE OR ADJUST DOOR LATCH MECHANISM... 22 TO REPLACE CONVECTION OVEN MOTOR ASSEMBLY ... 22 CONVECTION OVEN MOTOR ASSEMBLY ... 23 MAIN BURNER, PILOT BURNER & DOOR MICRO-SWITCH LOCATION ... 24 SECTION 4: COMMON WIRE DIAGRAMS ...

  • Page 4: Gas Convection Oven "Gas Specifications

    GAS CONVECTION OVEN "GAS SPECIFICATIONS” TOTAL BURNER B.T.U.'S ORIFICE 40,000 (.0781”) 60,000 (.0781”) 80,000 (.0781”) * - Gas pressure measured at burner manifold. ** - Gas pressure measured at redundant gas valve pressure tap. All models (single deck ovens) amperage rating is 6.2 (each oven). Manifold size is ¾" N.P.T. (National Pipe Thread).

  • Page 5: Manual Controls - "M

    Understanding the sequence of operation is necessary in properly trouble-shooting this appliance. In this section the sequence of operation will be covered first, as well as calibration and operation of components, and basic trouble shooting techniques for that specific model. Follow each sequence carefully, and get to understand its operation before moving on to trouble shooting.

  • Page 6: Weighting

    A thermocouple type test instrument is preferred for measuring oven temperatures accurately. Mercury thermometers are acceptable providing they can be proven accurate. Regardless of the type instrument used, it is most desirable to double-check it just before making an oven temperature check.

  • Page 7: Thermostat Operation

    five times doubling the thickness with each fold. After the fifth fold, place the thermocouple tip in the center of the aluminum piece and fold once more. Finally, fold in the sides so that the foil clings to the thermocouple tip. A mercury thermometer can be weighted in much the same way by wrapping several layers of aluminum foil around the bulb end thus creating the necessary mass.

  • Page 8: Electronic Controls - "E

    ELECTRONIC CONTROLS - “E” Sequence of Operation (With the Oven Doors Closed) Line Voltage is supplied to the Mode Switch, Door Switch and the Momentary Light Switch. Set Mode Switch to COOK and close the oven doors. Line Voltage is sent from Mode Switch to power up the Controller and to the AUX relay on the controller.

  • Page 9: Electronic Control Failure Codes

    ELECTRONIC CONTROL FAILURE CODES The GARLAND digital control has a self-diagnostic program. If a problem occurs within the digital controller, you may see one of the "F" codes. Below is a listing of the "F" codes with explanations: -F1- Relay output is enabled when not cooking. If this failure code appears in the display, the cook relay may be on even if the control is not cooking.

  • Page 10: User Preference Offset For The Electronic Controllers

    The controller needs voltage to operate and is capable of operating on three (3) different line voltages, 115 Vac, 208 Vac, 240 Vac. On the back of the Robertshaw COM6000 there are several ¼” male spade terminal or pin connections. The below is a drawing of the rear of a Robertshaw COM6000 Controller along with a definition of each of the pin connections.

  • Page 11: Com6000 Upo Mode

    The User Preference Offset is designed to enable the user to adjust the controlling temperature. There are two different styles of controllers used by GARLAND at the present time. They are the Robertshaw COM6000 and COM6700 Series. To determine which of the controllers you are working on, look at the back of the controller and you will see a sticker with a printed number like “PN:100-289-03”, below this number is the controller style number.

  • Page 12: Electronic Pilot & Main Burner Ignition Sequence

    UPO - User Preference Offset. Used by the user to adjust the controlling temperature +/- 50º in 1º increments. Set the time digits to 00:00. Set the temperature digits to X10º. Depress & hold the Start button for five seconds. “UPO”...

  • Page 13: Service

    The safety lockout timer circuit starts timing the moment the trial for pilot ignition starts. When the timing period runs out, the trial for ignition ends, and the control module goes into lockout. Before another attempt to start can be made, the S86 must be reset.

  • Page 14: S86 Checkout And Trouble Shooting

    and answering conditions in each box encountered, until a problem and/or the repair is explained. maintenance or repair, the trouble shooting sequence should be repeated until the trouble shooting procedure ends with a normal system operation. START TURN GAS SUPPLY OFF. TURN THERMOSTAT (CONTROLLER) TO CALL FOR HEAT...

  • Page 15: Check Spark Ignition Circuit

    CHECK GROUNDING A common ground is required for the pilot burner, the ignitor-sensor, the GND terminal of the S86, and the main burner. The main burner generally serves as the common ground. If the ground is poor or erratic, safety shutdowns may occur occasionally even though operation is normal at the time of the checkout.

  • Page 16: Section 3: Component Access Of Functional Components

    APPEARANCE SMALL BLUE FLAME LAZY YELLOW FLAME WAVING BLUE FLAME NOISY LIFTING BLOWING FLAME HARD SHARP FLAME SECTION 3: - A Check for lack of gas from: Clogged orifice filter Clogged pilot filter Low gas supply pressure Pilot adjustment at minimum Check for lack of air from: Large orifice Dirty lint screen, if used...

  • Page 17: Door Gasket Replacement

    This section will give you the best way to access component for replacement. COMPONENT LOCATIONS: Top Front Center Door Chain Door Catch Right Front Control Panel 24v Transformer, Ignition module Redundant gas valve Lower Front Door Micro-Switch Data Plate, Burner Package Inside Oven Oven Convection Motor Oven Interior Lights...

  • Page 18: To Remove Doors From The Oven

    Locate stainless steel door gasket, mounted to oven front frame. Remove the #10 Phillips sheet metal screw that attach the retainer to the oven's front frame. Remove stainless steel door gasket. Replace stainless steel door gasket and to reverse above procedure to re-install. To Remove Doors from the Oven 1.

  • Page 19: Installation Of Oven Doors

    3. Remove flat head metal screw 1/4”-20x1/2” 4. Push the door toward hinge and lift up. NOTE: Bottom bearing retainer will stay in place. 5. Remove the right door in the same manner. To Reinstall Doors onto Convection Oven 1. Reverse procedure above. 2. Close doors.

  • Page 20: Disassembly Of The Right Door (W/O Window)

    To disassemble left door: 1. Once the door has been removed from the oven (refer to instructions on the previous page), remove the 12 truss head 10 x ½ Phillips screws 2. Remove 2 allen head cap screws from the door handle 3.
  • Page 21 NOTICE: DEPENDENT RIGHT HAND DOOR SHOWN. 1. Once the door has been removed from the oven (refer to instructions on page 19), remove 9 truss head s.m.s. 10 x ½ from the top, bottom and left side (as shown) from the door panel 2.

  • Page 22: To Replace Or Adjust Door Latch Mechanism

    4. To adjust latch mechanism adjust by tightening or loosening adjustment nut. To Replace Convection Oven Motor Assembly (Drawing Below) 1. Open doors and remove all oven racks. 2. Remove 4 #10 sheet metal screws (that secure air baffle) and remove air baffle.

  • Page 23: Convection Oven Motor Assembly

    Assembly 1. Assemble motor mount plate, fastening four flat head m.s. 1/4-20x2½" 2. Secure each flat head m.s. 1/4-20x2½" 3. Attach motor mounting plate to motor the mounting tabs on motor 4. Insert shaft of motor ¼" away from the inner motor mounting plate 5.

  • Page 24: Main Burner, Pilot Burner & Door Micro-Switch Location

    Main Burner, Pilot Burner Removal & Door Micro Switch Location To access the Burners, Pilot or Door Switch - remove the lower combustion chamber, (not show). This exposes these components, also you will note that the rating or data plate is on the inside of the combustion shroud.

  • Page 25: Section 4: Common Wire Diagrams

    SECTION 4: - C OMMON IAGRAMS...

This manual is also suitable for:

Mco-gd-10eMco-gs-10eMco-gs-10m

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